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The Company - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2016 USD ($) | Dec. 31, 2016 USD ($) Segment
Disclosure Company Additional Information [Abstract] |  |
Subscription agreement date |  | Dec. 22, 2016
Preferred stock purchased, value under subscription agreement | $ 4,500,000 |
Cost-method investments, carrying value |  | $ 4,500,000
Dividends paid |  | 0
Amount paid withholding taxes in Canadian Revenue Agency |  | 7,600,000
Income tax expense related to intercompany dividends |  | 2,500,000
Accrued one-time income tax payment |  | $ 32,600,000
Number of reportable segments | Segment |  | 2

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